Mrs May’s official spokeswoman said the Government already has “well-established” channels of communication with Mr Trump’s team.

She pointed out that the Prime Minister has already had a phone conversation with Mr Trump, in which he invited her to visit Washington at the earliest opportunity and voiced his hopes of striking up a relationship comparable to that between Ronald Reagan and Margaret Thatcher.

‘The president-elect talked about enjoying the same relationship Reagan and Thatcher did,” said the spokeswoman. “I don’t remember there being any third person in that relationship.”